Table 3. Descriptive statistics for diameter, density, and basal area of spared trees and stumps
of the preferred firewood species, and Spearman rank correlations of these variables with fallow
history, the length of the last fallow period, and the number of cycles.

Variable Mean1 Range Spearman rank rs
STUMPS

Fallow length

Number of cycles

Minimum diameter (cm) 3.1 3-4 -0.383 ns 0.118 ns
Maximum diameter (cm) 15.4 6.1-33 0.792*** -0.744***
Mean diameter (cm) 6.6 4.4-11.7 0.741*** -0.694***
Density (stems/ha) 1212 300-2307 -0.082 ns 0.076 ns
Basal area (m2/ha) 4.4 0.7-9.9 0.736*** -0.681***
TREES
Minimum diameter (cm) 6.0 2.2-11 0.041 ns -0.021 ns
Maximum diameter (cm) 19.7 4.5-42 0.799*** -0.792***
Mean diameter (cm) 11.1 3.1-19.8 0.781*** -0.714***
Density (stems/ha) 237 43.5-954 -0.110 ns -0.012 ns
Basal area (m2/ha) 2.4 0.15-7.8 0.552** -0.578**
1Mean of estimates for each site (n = 25)
*P <0.05, **P <0.01, ***P <0.001, ns = not significant